The final meeting between Bale and McGregor's characters in the dark end of some dive is initially depressing («We set out to change the world.» (slantmagazine.com)
At the deeper end of the dive site we see sharks, turtles, and in season the famous Mola Mola (Sunfish). (baliocean.com)
At the end of a dive, divers must engage in a process called decompression, which eliminates the dissolved inert gases from the diver's body. (sciencedaily.com)